AeroFS: File syncing without cloud or server storage
Most people with multiple devices like PC, Tablet and smartphone probably use some sort of file syncing solutions based on cloud services like dropbox, box or Ubuntu One. AeroFS comes to change this by removing the need for the middle part of the file syncing technologies (cloud storage or server).
Technically, AeroFS file syncing is based on "peer-to-peer filesystem" where all the devices you have installed AeroFS on, are contributing to this file system. Communication happens peer-to-peer, so any two or more devices can talk to each other directly, without a middleman server, and regardless of whether you're on a corporate LAN, on the Internet, or in any other network.
You also do not need Internet connection on a home network. Install aeroFS on two or more home computers and unplug your home network from the Internet. Update some files on these computers, and you will see that AeroFS still syncs in this isolated network.
AeroFS File Syncing Security
Each computer running AeroFS has a 2048-bit RSA key, certified by AeroFS service to be authentic. This prevents "bad guys" from being able to impersonate you. When two computers communicate with each other, they perform "mutual authentication" using the keys. Because the connection is encrypted directly from one device to the other, data "in transit" is end-to-end encrypted and is safe from attacks.
The best part is that you can securely share your folders with anyone who has an e-mail address like your friends, your family or co-workers.
AeroFS file syncing is free, whether you want to share 1, 10, or 1,000 GB. You most probably already have all the storage you need because your files are only stored in your devices and not on the cloud.
This file syncing technology is yet in Beta state and in "invite only state"... so go to https://www.aerofs.com/ and add your email.